W3School TIY Editor
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<!DOCTYPE html> <html> <body> <p>单击按钮可显示时间。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function addZero(i) { if (i < 10) { i = "0" + i; } return i; } function myFunction() { var d = new Date(); var x = document.getElementById("demo"); var h = addZero(d.getHours()); var m = addZero(d.getMinutes()); var s = addZero(d.getSeconds()); x.innerHTML = h + ":" + m + ":" + s; } </script> </body> </html>